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old toro hydro system

I have an old toro hydro system(control valves are actuated by water pressure) came with house. ran for couple of years. controller out. want to change over. PROBLEM, i don't know where all the valves are located. is there a way to figure out where they are without digging up the whole yard??
david lp

-Or, you can rent a wire tracer. They are difficult to use if you've never used one before.

-You can also call an irrigation expert, and they'll do it all for you.

Try to find where the PVB (pressure vacuum breaker) is on the side of the house and the boxes may be located near that. Although, if the system is old, it may not have a PVB. Over time, the valve boxes will get covered be dirt/grass, covered by a bed of mulch for plants, or even the valves directly buried. (I HOPE NOT )

I'm no expert..........YET! I just like to suggest things and learn... See what the pro's have to say first.